Katy Perry has been accused of racism after performing at the AMAs in traditional Japanese dress.

Fans took to twitter to vent their disgust after Roar singer Katy opened the LA awards wearing Japanese kimono with a full face of porcelain make-up.

"Did anyone else just see Katie Perry's racist a**, Orientalist opening for the #AMA2013 ? How did anyone think that was ok?", one Twitter user screamed.

Another fan simply asked: "Why is Katie perry trying to be Japanese?"

Twitter storm

The 29-year-old was accused of "appropriating Asian culture" with her performance of new single Unconditionally in a satin kimono, heavy eye make-up and traditional dance.

Other fans jumped to the Kiss A Girl singer's defence Katy pointing out that her costume could have been a nod to her huge Japanese fan base after visiting the country this year.

One fan said: "At least she was respectful of the culture. I'll give her that." Others described her performance as "wonderful".

It isn't the first time the singer has been accused of racism towards Asian cultures. Speaking on Jimmy Kimmel in June she sparked controversy when she spoke about Japanese culture: " I’m so obsessed with you [Japanese race] I want to skin you and wear you like Versace!"

Furious bloggers accused the star of mocking culture.

Katy said she was familiar with the culture after her family took in Japanese lodgers when she was growing up.